PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1910-11. 
Part IV.] YOL. XXXI. [Pp. 417-576. 
CONTENTS. 
NO. 
XXVII. The Dissipation of Energy in Torsionally Oscillating 
Wires of Brass and other Materials, with the Effects pro- 
duced on the Laws of Torsional Oscillation by Change of 
Temperature, etc. By J. B. Ritchie, B.Sc., Carnegie 
Research Scholar in Physics, University College, Dundee. 
(' Communicated by Professor W. Peddie), . 
{Issued separately May 16, 1911.) 
XXVIII. An Apparatus for inducing Fatigue in Wires by means 
of repeated Extensional and Rotational Strains, with the 
Effects produced by such Fatigue on the Laws of Torsional 
Oscillation. By J. B. Ritchie, B.Sc., Carnegie Research 
Scholar in Physics, University College, Dundee. {Com- 
municated by Professor W. Peddie), ’ . 
{Issued separately May 16, 1911.) 
XXIX. Boole’s Unisignant. By Thomas Muir, LL.D., . . 448 
{Issued separately May 17, 1911.) 
XXX. Isopiestic Expansibility of Water at High Pressures and 
Temperatures. By W. Watson, M.A., B.Sc. ; 1851 Exhibi- 
tion Research Scholar, 1909-1910. {Communicated by 
Professor J. G. MacGregor), .... 456 
{Issued separately May 18, 1911.) 
XXXI. On some Nuclei of Cloudy Condensation. Part II. By 
John Aitken, F.R.S., ..... 478 
{Issued separately July 6, 1911.) 
XXXII. On the New Genus of Iron-bacteria, Spirophyllum fer- 
rugineum (Ellis). (A reply to criticism.) By Dr David 
Ellis, Lecturer in Botany and Bacteriology, Glasgow, and 
West of Scotland Technical College, Glasgow. (With 
Two Plates), . . . . . . .499 
{Issued separately July 7, 1911.) 
EDINBURGH : 
Published by ROBERT GRANT & SON, 107 Princes Street, and 
WILLIAMS & NORGATE, 14 Henrietta Street, Covent Garden, London. 
mdccccxi. 
Price Eleven Shillings and Threepence. 
PAGE 
424 
440 
